Echo Tracking in Transit Time Level Measurement
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Solution Overview
Problem
Transit time level measuring devices face challenges in accurately determining filling levels due to overlapping or obscured echoes, especially under changing environmental conditions, leading to inaccurate or unreliable measurements.
Innovation Solution
A transit time level measuring device with a tracking method that analyzes echo curves over time to identify and assign echoes to specific reflectors, using a processor to determine linear relationships between tracks and calculate the expected positions of echoes, allowing for reliable tracking of level changes independently of amplitude ratios or filling speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional echo tracking methods are used to determine filling levels, then the measurement process is simple, but the measurement precision deteriorates when echoes overlap or are obscured by noise
Solution Approach 1:
The patent transforms the echo tracking problem from a one-dimensional time-domain problem into a two-dimensional parameter space by introducing a second parameter (electrical distance or position). Echoes are represented as points (t_i, d_i) in this parameter space, and tracks are formed by connecting points that satisfy a linear relationship. This parameter transformation allows the system to distinguish between different echo sources even when they overlap in time, thereby improving measurement precision and reliability under changing environmental conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the linear relationship between track points is continuously updated and used to predict the position of subsequent echoes. The system uses previously established track relationships to guide the identification of new echoes, creating a self-correcting tracking system that maintains accuracy even when individual echoes are obscured or lost in noise.
2Loss of information
If multiple reflectors are present in the container, then more information about the filling medium is available, but the device complexity increases due to the need to differentiate and track multiple echo sources
Solution Approach 1:
By representing echoes in a two-dimensional parameter space (time, electrical distance) and establishing linear relationships between track points, the patent creates a systematic method for differentiating multiple echo sources. Each reflector generates a distinct track with its own linear relationship characteristics, allowing the system to automatically differentiate and track multiple reflectors without requiring complex manual configuration or differentiation logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate and reliable tracking of filling levels, even in the presence of interference or multiple echoes, by establishing a functional connection between echo positions, thereby improving measurement precision and consistency.
Implementation Method 1
These measuring devices emit electromagnetic or acoustic waves in the direction of a product surface. These waves are then fully or partially reflected by various reflectors.
Implementation Method 2
The level is determined from this recorded pulse. In other words, the electrical distances are abscissa values of the received signal when this is plotted in a coordinate system. These electrical distances correspond to the propagation times of the corresponding signal components of the impulse.
Data Source
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AI summary
The invention relates to an operating-time fill level measuring device and an operating-time fill level measuring method, in which the echoes of consecutive echo curves are grouped and combined into tracks. The linear relationship between two tracks is then determined, and said linear relationship is used in order to determine one or more unknowns. For example, the dielectric constant of the filling medium, the container length or the probe length, or the position of an expected echo can be derived from said linear relationship.